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One other question for you, RobG - I believe that a full-scale tunnel is quite expensive to build given equipment cost differences and to operate from a power standpoint, but is it really that significantly more expensive than a 60% scale tunnel?
It would seem a majority of the cost is going to be tied up in aquiring the engineers to calibrate / operate / maintain the equipment, run the tests and interpret the data. You'd still need this same technical expertise for a scale tunnel.
Sounds from your posts like you might have some experience with these matters.